Workers crate finished gun mounts for 20mm Oerlikon guns at General Motors plant in Pontiac, Michigan. Naval officer and shipping foreman inspect mounts to be crated. Workers board up crates of mounts. Workers on gun barrel production line, rough turning barrels before bore is drilled. Rough-turned barrels on conveyor, barrels put on lathe for turning. Workers at machine drill bores. Drilling machines with truck of barrels in the background. Worker at drilling machine. Views of workers at chambering machines. View of Gun testing range, naval officer and plant superintendent examine gun mechanism during test firing.
Workers enter General Motors Plant, Pontiac in Michigan. Overhead sign reads 'This is Our Busy Day War's Working for Uncle Sam'. Exterior of the Plant shows flag pole with 'E' pennant and Ordnance flag. Automobiles parked in the compound.
Government inspector makes final check of gun at General Motors Plant in Pontiac, Michigan. Navy anchor stamped. Rout tag. Officer and inspector stand near completely assembled gun and mount. They examine blue print and point to gun parts.